Remanent magnetism

Magnetic characteristic of rocks and deposits reflective of the earth's magnetic field at the time of the deposit's formation.
This category is also used for natural remanent magnetism.
Subtopics:
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Airborne geophysical surveys

Airborne surveys measuring the earth's magnetic field, resistivity or other electomagnetic properties, or gamma ray emission over parts of North America.

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An interpretation of the 1996 aeromagnetic data for the Santa Cruz basin, Tumacacori Mountains, Santa Rita Mountains, and Patagonia Mountains, South-Central Arizona

Measurements of in-situ magnetic properties of several map units to determined whether or not mapped lithologies were responsible for aeromagnetic anomalies observed in a previous high-resolution survey (data of Sweeney, 2000).

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Digitized data from ground geophysical surveys in Afghanistan

Surveys originally carried out by Soviet geophysicists from 1972 through 1974 were digitized. Georeferencing was problematic as were some of the measured characteristics; we explain what we did and how we have understood these data.

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Geophysical studies in the vicinity of the Warner Mountains and Surprise Valley, northeast California, northwest Nevada, and southern Oregon

Gravity station data and physical property measurements used to infer subsurface geologic structure

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Integrated investigations of environmental effects of historical mining in the Animas River watershed, San Juan county, Colorado

Major assessment of the environmental effects of historical mining in the Animas River watershed with GIS data files, tables, and plates.

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Introduction to potential fields: magnetics

Explanation of the Earth's magnetic field and how USGS measures it. Defines magnetic anomaly, induced and remanent magnetism in rocks, and describes magnetic anomaly maps.

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Magnetic map of the Irish Hills and surrounding areas, San Luis Obispo County, central California

Database includes new helicopter aeromagnetic data, point locations of the local maximum horizontal gradient derived from the aeromagnetic data, and physical property data.

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